Collin Zimmerman, MD
NPI 1396975256 · Hematology & Oncology Physician · San Diego, CA
Enrolled with Medicare as Practitioner - Medical Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Collin Zimmerman, MD is a Hematology & Oncology Physician provider in San Diego, CA (NPI 1396975256).
Provider details
- NPI number
- 1396975256
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 57153 (MN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
16 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
25 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 25 | $124 |
Typical Medicare-allowed amounts for these services range $124–$124 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 46 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Lenalidomide | 185 | 29 |
| Ondansetronbrand: Ondansetron Odt | 148 | 69 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 119 | 37 |
| Dexamethasone | 94 | 40 |
| Oxycodone Hcl | 88 | 17 |
| Acyclovir | 88 | 27 |
| Zanubrutinibbrand: Brukinsa | 71 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-07-24
- Last updated
- 2021-11-29
Frequently asked questions
- What is Collin Zimmerman's NPI number?
- Collin Zimmerman's National Provider Identifier (NPI) is 1396975256, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Collin Zimmerman's specialty?
- Collin Zimmerman is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Collin Zimmerman located?
- Collin Zimmerman's practice location on file with NPPES is 4647 Zion Ave, San Diego, CA 92120-2507.
- What is Collin Zimmerman's phone number?
- The practice phone number listed in the NPPES registry for Collin Zimmerman is (619) 528-5713.
- Does Collin Zimmerman accept Medicare?
- Collin Zimmerman is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Collin Zimmerman's NPI active?
- Yes — Collin Zimmerman's NPI (1396975256) is active in the NPPES registry as of the last update on 2021-11-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.